Indeed! IMHO biodiesel is the most promising of the biofuels. I'm surprised no one has mentioned algae as the most prolific crop for producing oil; it produces exponentially more usable oil than soy, palm, or rapeseed (algae produces between 5,000 and 15,000 gallons per acre/year). And it can be pond-cultivated in arid regions, thereby eliminating competition with productive farmland.
Won't happen anytime soon, but this guy thinks it's theoretically possible to replace all petroleum currently used in the U.S. for transportation purposes with homegrown biodiesel:
Wow, had no clue. I've got a half acre of property that is just taken up by grass right now and if I dig a........
After trying to watch the entire 43 minutes of the streaming video I came to the conclusion that if in fact their plan really works the first thing they need to do is get some people out front to deliver the message. I like the home spun look of the demo, but they need marketing help very badly.